Adaptive postfilter for low bitrate visual telephony noise removal
US6324301A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1996 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jan 24, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adaptive postfiltering arrangement for decoding video images is disclosed wherein the postfilter parameters used to control the strength of the postfilter are computed by the encoder at the time the video images are encoded and are transmitted to the postfilter as side information contained in the video image bitstream. The postfilter removes distortions from decoded video images, derived as a result of DCT coefficient quantization errors produced when the image is compressed for transmission to a decoder, and is based on computation of signal-to-noise ratios (SNRs), of one or more components of encoded video images. Other information about image content, such as face location information, can also be included in the side information sent to the postfilter in the video image bitstream, to modulate the postfilter strength according to the image content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.